feat: WSL support, js-yaml migration, and stability improvements

- PID/log files moved to ~/.hermes-web-ui/ for WSL compatibility
- Replace all regex YAML parsing with js-yaml in filesystem.ts
- Auto-detect WSL and use hermes gateway run for background startup
- Stop command: SIGTERM with SIGKILL fallback, clean stale PIDs
- Setup script: auto-install Node.js and hermes-web-ui

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "hermes-web-ui",
-  "version": "0.2.0-beta.1",
+  "version": "0.2.0",
   "description": "Hermes Agent Web UI - Chat and Job Management Dashboard",
   "repository": {
     "type": "git",